Time Node in Blender 2.81?
This is the super-quick-and-dirty way to do it:

Simply double click the value of the distortion and type #frame into  instead of a number.



Then press Enter.

This automagically creates a frame based driver.

The box will turn purple, indicating that it is being driven.



If you want to modify it, just double-click the value box and edit as desired.    Note that the hash disappears, in the driver editor as it is no longer required.



Yes, you can use simple mathematical expressions too e.g. frame/10

You can also right-click the purple box and select Edit Driver from the context menu.

Just remember if you want to make it a driver add the # symbol to the front.